• Yonghui Zhao, Haotian Luo, Yulong Ma, Jinlong Liang, Gonghai Han, Yongqing Xu, and Sheng Lu.
• Department of Orthopedics, the First People's Hospital of Yunnan Province, the Affiliated Hospital of Kunming University of Science and Technology, the Key Laboratory of Digital Orthopedics of Yunnan Province, Kunming, China; Department of Orthopedics, 920 Hospital of the Joint Logistic Support Force, Kunming, China.
• World Neurosurg. 2021 Feb 1; 146: e161-e167.

ObjectiveTo evaluate the safety and accuracy of S2 alar-iliac (S2AI) screw placement guided by a 3-dimensional (3D)-printed surgical guide template.MethodsThe data of 27 patients treated with S2AI screws were analyzed. S2AI surgical guide templates were designed and printed, and S2AI screw placement was completed intraoperatively with the guide templates. Postoperative computed tomography was performed to measure screw path parameters, namely the sagittal angle (SA), the transverse angle (TA), the horizontal distance (HD) between the entry point of the screw and the median sacral crest, and the vertical distance (VD) between the entry point of the screw and the lower edge of the first posterior sacral foramen. Screw placement was graded according to the Oh grading criteria.ResultsA total of 54 S2AI screws were placed. The screw grades were as follows: 52 screws were considered grade 0, 2 were grade 1, none were grade 2, and none were grade 3. Thus grade 0 accounted for 96.3% of the screws. When the preoperatively planned SA (32.3° ± 2.0°), TA (42.1° ± 3.9°), HD (5.1 ± 1.1) mm, and VD (19.0 ± 2.4) mm were compared with the corresponding postoperative SA (31.9° ± 3.8°), TA (42.5° ± 4.0°), HD (4.9 ± 1.1) mm, and VD (19.1 ± 2.3) mm, no significant differences were identified (P > 0.05).ConclusionsS2AI screw placement assisted by a 3D-printed surgical guide is safe and accurate.Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.

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